Midierror shared this video preview of Le Strum, a MIDI chord controller that they describe as like a cross between a Stylophone and an Omnichord:
Connect LE STRUM to your MIDI synthesizer or computer running synth software, hold down a combination of buttons to select a chord, then use the stylus to play MIDI notes by touching the contact pads on the top right of the board. As the name suggests, you can strum across chords using the stylus, providing an unique and expressive MIDI controller.
LE STRUM’s 36 chord buttons give you immediate access to 84 different chords (maj, min, dom7, maj7, min7, aug, dim for 12 root notes). You can also play sus4, add6 and add9 chord variations. It is great for learning about chord progressions and can be a helpful songwriting tool.
LE STRUM has several performance modes which are accessed by holding the MODE button while pressing one of the top row of chord buttons.